Signal 11 :
"Unaligned memory access" is a message coming back from the UNIX operating system
letting you know that an Oracle executable has tried to access memory incorrectly. It's not a problem
with UNIX but is part of the operating system's mechanism of protecting itself from crashing.
Simple causes may include:
1) Not enough disk space in $APPL_TOP/out directory where the concurrent manager creates the
report output files.
2)Lack of storage space in table spaces, rollback segments etc
3)Very complex SQL statements with many Group By columns (which may not all be required)
4)Incorrect OS permission’s
5)Parameter mismatches
6)The reports were FTPed incorrectly (ASCII instead of binary)
7)A 'Numeric or Value error' on some procedure code (although this may also cause a Signal 4
error). Typically this is because you have a field or variable which is too small to hold a value
passed to it, which often happens when you are summing values.